The term AIR PRODUCER can be broken down into two words: AIR and PRODUCER. An AIR is a mixture of gases, primarily nitrogen and oxygen, that surrounds the Earth and is necessary for life. A PRODUCER is someone who oversees the making of a product or service. In this case, an AIR PRODUCER is someone who oversees the production of AIR, such as a scientist or engineer. The crossword solution SONGSTER is an 8-letter word meaning a singer or composer of songs. Therefore, an AIR PRODUCER is someone who oversees the production of AIR, while a SONGSTER is a singer or composer of songs.